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Linux is a family of open source Unix-like operating systems based
on the Linux kernel. The Linux kernel is an operating system kernel
first released by Linus Torvalds on 17 September 1991. Linux
distributions include the Linux kernel, system software and
libraries. Popular free open source Linux distributions include
Debian, Fedora, and Ubuntu. Commercial Linux distributions include
Red Hat Enterprise Linux and SUSE Linux Enterprise Server. Linux may
be freely modified and redistributed. Anyone on the planet may
create a Linux distribution for any purpose.

Unix (trademarked as the UNIX certification mark) is a very mature
family of multitasking, multiuser computer operating systems that
evolved from the original AT&T Unix. Unix development starting in
the 1970s by legendary Bell Labs programmers Ken Thompson, Dennis
Ritchie, and others. Unix was first targeted for the Bell System and
AT&T licensed Unix to outside parties. In the 1970s time period,
this lead to a variety of for-profit as well as not-for-profit Unix
variants.

In the early days, this included the University of California,
Berkeley (BSD), Microsoft (Xenix), IBM (AIX), and Sun Microsystems
(Solaris). In the early 1990s, AT&T sold their Unix rights to
Novell. In 1995 Novell sold their Unix business to the Santa Cruz
Operation (SCO). The UNIX trademark was passed to The Open Group, a
"neutral" industry consortium. The Open Group promoted the use of
the UNIX trademark for certified operating systems that comply with
the Single UNIX Specification (SUS). In 2014 Apple's macOS became
the Unix version with the largest global install base and macOS
remains the largest Unix-user base today.

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